Don't like paying for pressurized air for your bike tires? Don't like energy inefficient vehicles? Make this automatic bicycle pump on the cheap and steal from a car.

Instructables user Aleksi shows us how easy it can be to make a pocketable automatic bike pump that can take pressurized air from car tires for use in your bicycle's tires instead. Here's what you'll need:

A 50cm-100cm long air hose

Two chucks

From there it's pretty simple. You just need to push the hose into the chucks, find a victim car (Aleksi suggests a Hummer), and steal some pressurized air. Of course, if you're not in the mood to steal from others you can always do the "right thing" and steal from yourself (assuming you have a car, that is).

Ed. note: To clarify, since we're hearing a lot of complaints in the comments: It's Evil Week, so the post is written with "stealing" in the headline, but you don't have to use much imagination to understand that you could also use this idea without the whole stealing part.